Feasibility of High-Resolution PET Detector Readout by 2-D Tetra-Lateral Position-Sensitive Silicon Photomultiplier

In this paper, we present the feasibility of high-resolution PET detector readout by a 2-D tetra-lateral position-sensitive Silicon photomultiplier with an intrinsic cap resistive layer for charge division (CRL-SiPM). The scintillation imaging sensor for 511 keV gamma ray detection is realized by coupling a 5 × 5 array of 0.45 × 0.45 × 6 mm
³
LYSO crystals to the CRL-SiPM with an active area of 2.77 × 2.77 mm
²
and micro APD cell pitch of ~10 μm. The scintillator arrays are clearly distinguished and good scintillator array imaging with little position distortion has been achieved. An energy resolution of ~13.5% and coincidence time resolution of 555 ps are demonstrated, respectively. Therefore, the potential PET imaging sensor with greatly reduced readout channels has been verified.